52-20-02: Master Rod Bearing Oil Supply
FAA order 52-20-02 is an airworthiness directive. The FAA's subject line: Master Rod Bearing Oil Supply. System: engine.
What it applies to as the FAA lists it
- Kind of product
- Engine
- Makes
- Curtiss-Wright/Marquette, Inc.
- Models
- Double Row Cyclone 739C18BA3, Double Row Cyclone 745C18BA3, Double Row Cyclone 745C18BA4, Double Row Cyclone 749C18BD1, Double Row Cyclone 749C18BD3
Dates and paperwork
- Docket
- Unknown
- Status
- Current
- The FAA's document
- Read the order on the FAA's site
The order itself the regulatory text, as published
Show the full text (500 characters)
52-20-02 WRIGHT: Applies to All Models C18BA and C18BD Engines.
Compliance required as soon as possible but not later than October 31, 1952.
To prevent crankpin sludge from washing into the master rod bearing oil supply passages causing failure of the bearing, the use of oil dilution must be discontinued and the dilution lines disconnected or removed. This restriction on oil dilution is to continue until an adequate sludge controlling device is developed and incorporated in these engines.
Source: FAA Dynamic Regulatory System, airworthiness directives. The FAA's document is the authority; the register counts are this site's, from the FAA register of November 6, 2026. Connections as data: /graph/directive/52-20-02.json · aircraft systems.